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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7aa519b655049e4ebec361140a605678c7163efe04b5ac4d2fd61fe60b6d856' 
  AND token = 'kdLnpPRnXFxXi9HookRLbBG0rwn5ezAvymrN1rPjvNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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