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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4315c9c1b09d6080586e9570be73c0b6e13460792dce13b85596cf7907be671e' 
  AND token = 'rLwxVL4nd2ZB5ynvJnPeLjU9tyOcuYaMN4oOC+120Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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