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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68e43445ccf88fef7c7ff70815c1963a90383d9f60398dd0afd87884e9c44ceb' 
  AND token = 'ZAtjb7oEyIU83aQe7e+zQxzpt0uOtKHxqrw10thhRC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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