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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0cd26edefb80b2ca3aa1ba95f2e8a89ec507953e99f3f6048441c6033bf8be1' 
  AND token = 'FIAKtKbNbiX5ApqxuZKNdV5J52vE1GjSiYDY6kXFf20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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