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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '966e049b213010a214690c837140c68c6be05c12eb998771cc97ada82982c1c9' 
  AND token = '58mW6vnlxE0N2OT640MTzhkPpqbbzL/f24LOauwuiko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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