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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5d56fbc0efa8be31536672e8b71c8640d03ac15af2108af5d2ea5c3eafcbb10' 
  AND token = '8Snpy0CYb58ankJr5sYCscTuon3KCENedi6xHnDi9wA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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