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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c44f0c1446423678b44efa2acb3cc273a98cf9bd3788ec1b23670b409d21d73b' 
  AND token = 'qMsajT6Gss9Q9aM7mbk+5fcoeWEknTEOcWcydlBowZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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