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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '089e9e9aa5c12a686fc0e692ecdce211f9b9f8ccdebbd8efe8f0e0e6b1318b8d' 
  AND token = 'x0hc9tVac7GfEgVsENKdk9DOOkPLubgucWlSks5r88o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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