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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '693558b27d5c12c290f0ce0f8aef2a426579c653d29314c8129410b69b69962d' 
  AND token = 'Lztvj3UpqPAl23U+00jShr2Q6MkrphhS9+HZr/YmfcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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