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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc944d24a8cb4f5f62b1443f04f1a6cfad838b41d81c6e8ea86c6bdcff3d26a1' 
  AND token = 'U/n/c95Luj9iaO7V9jTRpUtd7OPRsExWW82zj+dHGD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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