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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b82cd244b8dba050d9cad7c30cb7ce6fad90b3dd9cfee7869914feaae6e0514' 
  AND token = '/D20Avv/ctKgzruAjpul9FTww61VN+sKL2BHseI0q0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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