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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3e3c5b1beaadbf2ef71a05a6972ce80224d6ea4784cc6792b7d893a95d891c6' 
  AND token = '66hENOh9yWnCgvSp8ibCMo0eFkWViVHOmNX2IzFkaWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00103

JSON explain

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