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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e28c965e69c019ed8218eb08c0b9486c1b5d2b606141ee8fd475425918faf2fc' 
  AND token = 'X9rZCqnX2m4WFTSq4mFqNErYiNq6gYBoa7wQiOaW3XE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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