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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76d187fbba16405a357ab5c30de3488036557fabd3b551401ee0a4e196827614' 
  AND token = 'YEWGufonlh3FMh7RMxrUEBOCp5oRiMIaIbu/zA4/M/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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