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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65a37c0805a5d2950784d2b185093d41930c394e0c4b11f4bc330eee6374ed30' 
  AND token = 'KPT19fyyZlKUcv7sn5nB2FzH06BuI22A6bV1MRguBEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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