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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df7c69c3430307ce326aee0160be8fe1e0f5bdaff8d730999be64e5c0f9ec6fa' 
  AND token = 'jjXwN0iO++7UIYm9o+78MEoAeGAJxUka5yUb2lIXs/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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