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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67e5a5140a7830128ea4cc72c43d1c27ad4d69b5e36e3c0d10632457842c4ff8' 
  AND token = 'aHx02TZhhmtitXV6u6BNaM0lOl3wz0mIVj0zdegtdFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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