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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca6507dbf881459604fe5b21a13ae1d28c52185eac924c52dff72fa58c3a65e7' 
  AND token = 'BZd9wINM0aTsf136WSkPOcb7oJhh/omTz+j6ZzfE+GI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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