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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cc4cb3cf7126605098b5b013856037c0fb93c7c20407bf593768647076119b4' 
  AND token = '3PjJMR6vaKczWNCz/PIF55AYIxSTr7estU2Pk8UCe1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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