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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd26d3506f406a01fa6592dfda08ca2c967cef46c6e8e0b7dcd1d5ab3ba1eee64' 
  AND token = 'iFaXlZynutYojYBts/cGtleVMGE4wI7s7qzCtemA+x8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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