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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd44975ac29ba5eca1a05c0ba5aa41e8fb122f8b8d15b4bdd9e11247986006c2f' 
  AND token = '8gFdJ02f1liJbKCUoXsoo9/2U2VhmI5A9pHKeVXmxws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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