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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84e2a52d161811cc95e42ac7921ee2d55a6a954c57c46bf73baf9ebfc8c95bf2' 
  AND token = 'uqjfTLJArlkQQovWtM8qWQ/G9q/EWlOySr/0eja+cWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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