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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a24e97da2c16bb3158ecbdbd20feb9d9ca87818acdaf296ad45d2034d0514a4' 
  AND token = 'zoZFMkMc5ZppRM4RTadDcRU7NGKLk29ly6oGjE9ek/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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