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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f71a6f2e3a4eec57b2fc875b5579432ad870521183cad3a4e5fb72d208795f4' 
  AND token = 'NqD5BcS2P1qrFsrtDJkZTJCe6zD4wkjQdBak3eXtf44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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