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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9fbee158d090a2782a0a26bf91b9d84b3a3b34e990fd5d81f89d7a7339913cd' 
  AND token = 'ERacxu2QWmELfr6oc5DqTJS5n1IMoD7qURJLaMIzssY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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