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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a837e2a3ed7ce680b9b27cc1c351360c4309012c0c27ec7e29f7a6901b8fb2c3' 
  AND token = 'k+rCwThwlk1EoHq1v4N5sV6kKMS46jCp5Wv8kyFfGao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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