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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c8692bebb6b0482df08bfa767266290be55bfd0ebc21182ea96270532a32166' 
  AND token = 'HUbfYtWm+UuDYZ46ADbg9YdBD70VIV5aob3vpBo0diU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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