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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d495c0c327b4c77cfd7a09542fdc5bb8796938d025ad7d806049d32651f0e56' 
  AND token = 'qhzcDuhPPTB4aW1QoyCNv8vYBy3L05N/l65DA6VzweY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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