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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b5b8a7f0f5134e37f7a0ed220830c0b516b48836bb27ee7416c806fc4964ff0' 
  AND token = 'TjCqbXAOqbeQOCERRAd38n9fDlV8Oei99C5Am1uhf3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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