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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb6d61ed553fef94dd8330914bb131047cacf874270604c8ac895697ce3314c1' 
  AND token = '8Tl4mNkP5o4ri+VTXkk55r3qoyeRxCd6pDy4RNWQ1iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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