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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91946526391b88bf6a128128612faa0a3ea15e04f0f53d1efdebfc8f35f4c97d' 
  AND token = 'V5i0oCO9L3M9sz4ZboTBEYlH7LOOIStXK9bPdc/ArZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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