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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0021fff6176bb8b24d54b5c2fdddbb51ab9669500e47b1efb193716b0587d1ae' 
  AND token = 'M36IrfwWEx/wi8DvClv8K+OPaQRLKaGMNt7FvxSOkII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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