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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8271e4b542fed3fb5a458fddd862b5b8ad27d9686e6f0dcdb586f2191a6b341c' 
  AND token = '3QoWhWICbG9QaQj4LF9QQP2aE9toFTGnZXdDjimmiq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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