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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0ade5f6a124b4488b93193b4168176ef6055ed9c81de6a287653cb86eb8541d' 
  AND token = 'pGbnaEl2IKolLJYvM5mCjXDm90FxUCe7Ec0Cc+m1b6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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