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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d9bbbeb7ecd5d662262641dafe0a24ad5c8261295aaff2ff42b0c0029ff0a1e' 
  AND token = '3U/1UBeDauurPS8u2u/skfqAvNzUe2Agqq20QL3kmbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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