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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dbd701e9bfe2c9adce3f84f7075af683341524bc440be7963329d55b5f5221e' 
  AND token = 'FfRI5YP75mThS6BdRPDMiKDMMlgimIMxeJv40nqte7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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