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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bc9cfa4d7f7cd3ebe6fca684a104a600431b3ef1aef17bb0bffbe25b42f5ff2' 
  AND token = 'RfvPg0M16nts5kCs+9+FtdLjt90cr/Zb3VyH7l/Nphw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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