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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fa0b6d8b1f2e88a919d4e21e8d260a58f93cd6ed49e4a8ebfc3689421145274' 
  AND token = '7SARP/je5uQwG6PLU97djdYeyqf1ZMq2P/l42llPHKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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