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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b466c98e1ed318e118b002ed466dbd08700cc7e240e87a673752daa272943362' 
  AND token = '7nKADfd7w5253/zTjeTkwh2fpd+vuZtdHpc5sE+s79Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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