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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfa9bded69c71159cad96eaee0ab10c5346bc78b3a794574fba0b59748e441d1' 
  AND token = 'LXSz3gjd+yATjq3bpso88m2Sj63sN5EMJulSckNFXmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}