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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a95d85e167a29db4e6ca5ec63a139cc9656c7685cbd5e0e3406e386aa1a91db' 
  AND token = '4RNrKMLHDE61FzvOQ2GCOAMqRzIzkEYg8AY0Nv98R50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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