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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c06eb00596d8b3330b8b1792ee8b49251681daf5ccb8bce410d88dd4e866ba4' 
  AND token = '4rd2PY07rfUANNHLwysbdgxiZjAca9zX3J5OuUX93tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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