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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c297df17ea5ff6e86018fa7e49590d531eceee5661b536f0647db9459ec2811' 
  AND token = 'UjPGfyy3LKO1CWkl6x426dZS4t+uAq+7opWeOSdMFZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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