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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74b39980706b597dd04439c91f10b12dd5796f859cb79e8d4d5c0034d4b095f5' 
  AND token = '4osJcgT63G9OMnmxFqTtrltX7/K34NWlVtvx3eu+PtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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