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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '675af2ba9da2a269ac36499a3aa58b1845eed3ec498d942b6c28d19bc4ae90f1' 
  AND token = 'dENZscRLtD5TFhVZ+jPLjqhaoqfquxStHPzrp8ypoHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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