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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6538fc8f33cd2514fb4cbf9e6a89b093aeeda5f2471ef08c4017a572d82dd31f' 
  AND token = 'G2bavpXpz7bZZJqK5w3JutQakpescknetxD+JlMhObI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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