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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdf763cabb6bd2c1fd514fb8880138cc2d6b8d5a33d21545d60983991a099d67' 
  AND token = 'qlqFvU1x2r06ttaFcrgAJPQzYg4E6OqaFK+F6kShK+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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