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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96058049ff91f0e25752669ff817d41a25ba0c70fa6d749411cec03d7b849c83' 
  AND token = 'uqzBhn4WnU9b3KtTVcU8ZQCws5bMK7aB12f51gEFTCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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