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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8389b2f42d6ebe17fe7e5dd26435c04908091b465999e8f43d07d8c7034d7218' 
  AND token = 'aVLg42tSTp761PMGAp2u8K9QKt4W4z4MZw0QEE0grSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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