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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a14b48f9877e8fe483b47071a84e99230caaa9934fdf5ea486dd75df8ef4c04e' 
  AND token = 'RohqyuYCZQV72mtba0UMlkOMcowD0e4SeE7TlSuqAZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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