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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c974bc986c3c559d863797394c304a95d90aa10b564a10c91851b617ba79928a' 
  AND token = 'UCLgatgNEgaIQTFb8cKYBwfLfKUK3RrNMt0jBZkUpJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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