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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '285239cb634c78f7174929c612690d3a038a105a214fc1ebe554cbd02c3eb0f0' 
  AND token = 'f2l9jgDxg0+R0w8JgK2doEz5e6FO2K6yN1dmVCuc6xY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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