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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a694a8cb9dfe1a0ff01a0482110a4735e96da117aeb136de8baf6a93f8a9054' 
  AND token = 'qm4j2nhusP6En7mFwgsKKHatanO/2zmpY4V4o8kWG8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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