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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '921fb4cb28cdb91c8b9893c56a60b8a987561e6af0f7b162a5390e164e37fa70' 
  AND token = 'aG/C6AQdGhxBFkBWnJnuaOxNFC4734qpzaqiim8foLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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