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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16786605480e421db4671101ca7e5fa01062880b52289b7c1afe285c5e0a677e' 
  AND token = '7Xz6WNhQ24BrQznPp3YLRz5wG58zgxGgYTF2BQHgNqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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