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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70e255fdb57aa420ca0bb82b10970eb06b3d6e9b290d4538499feb897eadb259' 
  AND token = 'V47NlY2RSulFOIfrJQASc7ugX+tZriRiQnzIqEEbwo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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