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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '012fe3d3a3724928b44968c6c76524c2bce8e2327948eafd1a1b19930c3f869e' 
  AND token = '6pIhKKwk38tQmMUyC1xGaJCjQZ76ZqM1L5u31nLP5t4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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