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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b532ee0cd8d35379ac10683bdb4af1af4d9705d4ad247309c8cc625aa57c8fb2' 
  AND token = 'VoDzw6OK9ZlDcqq+tmt3t/pbb3ZQ0pjs17O7DXQp9/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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