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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '196072ee990ccc6e059c146fb389f01251e43de2476db435dabf8d0703e26e4e' 
  AND token = '2ruK4Ukr7JnJcusM1aXdV57ytHZf1C+fmZFo1W42snU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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